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A method for improving thermal stability of luminescent materials

A technology of luminescent materials and thermal stability, which is applied in the field of luminescent material modification, can solve the problems that other materials have not been tried and the coating thickness cannot be controlled, no explanation is made, and the process setting is not explained, so as to achieve controllable coating thickness , the effect of high luminous intensity

Active Publication Date: 2018-04-20
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Hou Zhiqing and others used tetraethyl orthosilicate as the Si source, and coated a layer of dense SiO2 on the surface of the luminescent material, which played a thermal insulation effect, but did not try other materials and the coating thickness could not be controlled (Hou Zhiqing. Li Zhiqiang. Liu Dongzhou. Xu Liyun .Zhao Qichang Research on the coating of afterglow phosphor SrAl2O4:Eu2+,Dy3+[Journal Papers]-Journal of Hebei University, Natural Science Edition, 2008(03)); Patent CN 103556129A discloses a method using atomic layering technology (ALD) The method of coating nano-scale oxide films on phosphor powder, and the basic structure and process steps of ALD equipment are explained, but what type of coating material is used for different phosphor materials is not explained. For the reactor Selection methods and process settings for different materials not stated

Method used

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  • A method for improving thermal stability of luminescent materials
  • A method for improving thermal stability of luminescent materials
  • A method for improving thermal stability of luminescent materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Coated SrSi 2 o 4 : Eu 2+ Phosphor powder samples are subjected to particle size classification through a 400-mesh vibrating sieve to obtain samples with a particle size of 1-10 microns, which are coated with a fluidized bed (shown in the comments) image 3 ), select alumina as the coating material, trimethylaluminum as the metal organic gas aluminum source, nitrogen as the carrier gas, and water as the oxide, and the residence time of each gas is: nitrogen: metal organic gas: nitrogen: oxygen = 2min; 20min; 10min; 0.5min. Sampling was performed at the 40th cycle, the 80th cycle, the 120th cycle, the 160th cycle, and the 200th cycle. Through transmission electron microscopy (TEM) the thickness of the film material of the film material on the surface of the material (see Table 1), EDS assisted to determine that the aluminum content of the coating layer increased significantly, and basically no silicon element could be observed after 200 cycles (see Table 1). The TEM ...

Embodiment 2

[0051] The enveloped CaS:Eu 2+Phosphor powder samples are subjected to particle size classification through a 500-mesh vibrating sieve to obtain samples with a particle size of less than 1 micron, which are coated in a fluidized bed reactor (shown in the comments) image 3 ), select alumina as the coating material, trimethylaluminum as the aluminum source, nitrogen as the carrier gas, and water as the oxide, and the residence time of each gas is: nitrogen: metal organic gas: nitrogen: oxygen = 2min; 20min; 10min ; 0.5 min. Sampling was performed at the 40th cycle, the 80th cycle, the 120th cycle, the 160th cycle, and the 200th cycle. Through the thickness of the film material of the film material on the surface of the material by transmission electron microscopy (TEM) (see Table 2), EDS assisted to determine that the aluminum content of the coating layer increased significantly, and basically no calcium element could be observed after 200 cycles (see Table 2).

[0052] Table...

Embodiment 3

[0055] The enveloped CaS:Eu 2+ Phosphor powder samples are subjected to particle size classification through a 400-mesh vibrating sieve to obtain samples with a particle size below 1 micron, which are coated with a vibrating bed (showing opinions Figure 5 ), select titanium oxide as the coating material, dicarbonyl bis(cyclopentadienyl) titanium as the titanium source, nitrogen as the carrier gas, and water as the oxide, and the residence time of each gas is: nitrogen: metal organic gas: nitrogen: Oxygen = 2min; 20min; 10min; 0.5min. Sampling was performed at the 40th cycle, the 80th cycle, the 120th cycle, the 160th cycle, and the 200th cycle. Through the thickness of the film material of the film material on the surface of the material by transmission electron microscopy (TEM) (see Table 3), EDS assisted to determine that the titanium content of the coating layer increased significantly, and basically no calcium element could be observed after 200 cycles (see Table 3).

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Abstract

The invention discloses a method for improving heat stability of a luminescent material. After size grading is carried out, different reactors are used for coating according to materials with different sizes, and the parameters in the coating process are strictly controlled, so that the obtained coating material can provide heat insulation protection and improve the heat stability of the luminescent material on the premise of not influencing the luminescence efficiency of the material.

Description

technical field [0001] The invention belongs to the technical field of modification of luminescent materials, and in particular relates to a method for improving the thermal stability of luminescent materials. Background technique [0002] Luminescent materials can be divided into series of phosphors such as silicate, aluminate, phosphate, sulfide and nitride according to different basic materials. Phosphor powders in different application fields are used in very different environments. For example, phosphor powders for trichromatic lamps need to withstand the bombardment of ultraviolet rays and high-energy electrons, and phosphor powders need to have the ability to withstand ultraviolet rays and high-energy electrons; phosphor powders for LEDs are usually used at temperatures It will reach 80-150°C, so the phosphor needs to have a certain heat resistance. In addition, some phosphors also lose their luminescent properties due to the oxidation of activator ions under high tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/59C09K11/56C09K11/64
CPCC09K11/025C09K11/7731C09K11/7734
Inventor 周智黄浩黄升雄唐巍周子迁
Owner HUNAN AGRICULTURAL UNIV
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